「テストは愚直&&網羅的に書くほどよい」という誤解 / Test Smarter, Not Harder

"モバイルアプリのテストコードどうしてる？ 現場Tips共有会" ( https://findy-tools.connpass.com/event/359490/ ) での発表資料です。

Transcript

1. ʮςετ͸۪௚໢ཏతʹॻ͘΄ͲΑ͍ʯ
   
   
   
   ͱ͍͏ޡղ
   
   
   
   
   .VOFUPTIJ
   *TIJLBXB
2. ςετͰ͸ʜ
   ʮ%3:
   Λ࣮ફ͢Δඞཁ͸ͳ͍ʯ
   ʮϧʔϓ΍෼ذΛॻ͘ͳʯ
   ʮߟ͑ΒΕΔέʔεΛ໢ཏͤΑʯ
   Ұཧ͋Δʜ͕ۃ୺͗͢Δͱٕज़తෛ࠴ͷݪҼʹ ͜͏ݴΘΕͨ͜ͱ͸͋Γ·ͤΜ͔ʁ
3. %3:ϧʔϓ෼ذΛ࢖Θͳ͍
   ςετͷ҆ఆԽ
   Մಡੑͷ୲อ
   έʔεΛ໢ཏ͢Δ
   જࡏతͳόάͷൃݟ
   ࣗಈԽςετͷ໨త
   ඼࣭ͷ୲อ
   ੜ࢈ੑͷ޲্
   ඼࣭΍ੜ࢈ੑΛ٘ਜ਼ʹ͢Δϧʔϧ͸ຊ຤స౗ ϧʔϧͷഎܠΛಡΉ
4. ΞΧ΢ϯτछผ
   'SFF
   4UBOEBSE
   1MVT
   ʜ 1SPGFTTJPOBM
   6MUJNBUF
   
   छผมߋͰ͋ΓಘΔέʔε
    'SFF
   ˠ
   1MVT
   4UBOEBSE
   ˠ
   1MVT
   1MVT
   ˠ
   1MVT
   ʜ
    ੾Γସ͑੒ޭ
   ࣦഊ
   ωοτϫʔΫ
   ೝূ
   ظؒ
   ܾࡁ
   ʜ έʔεελσΟ
   ΞΧ΢ϯτछผมߋ
   
5. ࣅͨΑ͏ͳςετίʔυͷେྔൃੜ
   class UpdateAccountTypeUseCaseTest : FunSpec({ test("Changes successfully the account type from Free to Plus") { /*...setup...*/ repository.setCurrentAccountType(AccountType.FREE) val result = useCase.execute(AccountType.PLUS) result shouldBe UpgradeResult.Success repository.getCurrentAccountType() shouldBe AccountType.PLUS } test("Changes successfully the account type from Standard to Plus") { /*...similar setup...*/ repository.setCurrentAccountType(AccountType.STANDARD) /*...similar action & verification...*/ } test(/*...similar test...*/) { /*...*/ }; test(/*...*/) { /*...*/ }; /*...*/ έʔεελσΟ
   ΞΧ΢ϯτछผมߋ
   
6. ੜ࢈ੑͱίʔυ඼࣭ͷ௿ԼͷݪҼ
   ࢓༷มߋ࣌ͷमਖ਼ίετ૿Ճ
    ΞΧ΢ϯτछผͷ௥Ճ
    ґଘઌͷϞδϡʔϧ΍
   "1*
   ͷߋ৽
   
   ๲େͳςετͷมߋʹΑΔόάͷݟམͱ͠ έʔεελσΟ
   ΞΧ΢ϯτछผมߋ
   
7. ʮίʔυ͸ෛ࠴Ͱ͋ΔʯCZ
   5JN
   0UUJOHFS
    ίʔυͷ
   30*
   Λߟྀ
    ࠷খݶͷ࣮૷ͰՁ஋Λఏڙ
   ϥΠϒϥϦར༻
   ࢓༷มߋ
   ʜ
   ʮςετίʔυ΋ෛ࠴Ͱ͋ΔʯCZ
   NVOFUPTIJ
    ࠷খݶͷςετͰ඼࣭ͱੜ࢈ੑΛ୲อ
   ॻ͔ͳͯ͘ࡁΉͳΒͦΕʹӽͨ͜͠ͱ͸ͳ͍ ΩʔͱͳΔΞΠσΟΞ
8. ςετର৅ΛݮΒ͢
    έʔεΛந৅Խ෼ղ͢Δ
    ੩తݕূʹஔ͖׵͑Δ
   ϩδοΫͷॏෳΛݮΒ͢
    ύϥϝʔλͱϩδοΫΛ෼཭͢Δ
    5FTU
   6UJMJUZ
   Λ࡞Δ ࠷খݶͷςετΛ࣮ݱ͢ΔͨΊʹ
9. ςετର৅ΛݮΒ͢
    έʔεΛந৅Խ෼ղ͢Δ
    ੩తݕূʹஔ͖׵͑Δ
   ϩδοΫͷॏෳΛݮΒ͢
    ύϥϝʔλͱϩδοΫΛ෼཭͢Δ
    5FTU
   6UJMJUZ
   Λ࡞Δ ࠷খݶͷςετΛ࣮ݱ͢ΔͨΊʹ
10. ςετΛॻ͖࢝ΊΔલʹঢ়ଶͷґଘΛ੔ཧ͢Δ
    έʔεΛந৅Խͯ͠
    
    ͭʹ·ͱΊΔ
     ྫ
    'SFF
    UP
    1SP
    ͱ
    1MVT
    UP
    1SP
    Λ
    6QHSBEF
    UP
    1SP
    ʹϚʔδ
    ঢ়ଶͷ૊Έ߹ΘͤΛ෼ղ͢Δ
     ྫ
    "
    UP
    #
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    "
    ͱ
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    #
    ʹ෼ղ
    
    Λ
    
    ʹ N × M N + M έʔεΛந৅Խ෼ղ͢Δ
    
11. class UpdateAccountTypeUseCaseTest : FunSpec({ test("Changes successfully the account type from Free to Plus") { val repository = AccountRepository(/*...*/) val useCase = UpdateAccountTypeUseCase(/*...*/) repository.setCurrentAccountType(AccountType.FREE) val result = useCase.execute(AccountType.PLUS) result shouldBe UpgradeResult.Success repository.getCurrentAccountType() shouldBe AccountType.PLUS } test("Changes successfully the account type from Standard to Plus") { /*...similar setup...*/ val result = useCase.execute(AccountType.PLUS) /*...similar verification...*/ } έʔεΛந৅Խ෼ղ͢Δ
    
12. class UpdateAccountTypeUseCaseTest : FunSpec({ test("Upgrades successfully the account type") { val repository = AccountRepository(/*...*/) val useCase = UpdateAccountTypeUseCase(/*...*/) repository.setCurrentAccountType(AccountType.FREE) val result = useCase.execute(AccountType.PLUS) result shouldBe UpgradeResult.Success repository.getCurrentAccountType() shouldBe AccountType.PLUS } έʔεΛந৅Խ෼ղ͢Δ
    
13. ςετର৅ΛݮΒ͢
     έʔεΛந৅Խ෼ղ͢Δ
     ੩తݕূʹஔ͖׵͑Δ
    ϩδοΫͷॏෳΛݮΒ͢
     ύϥϝʔλͱϩδοΫΛ෼཭͢Δ
     5FTU
    6UJMJUZ
    Λ࡞Δ ࠷খݶͷςετΛ࣮ݱ͢ΔͨΊʹ
14. ੩తݕূ
    ओʹܕνΣοΫ
    Ͱςετ͕ෆཁͳઃܭʹ͢Δ
     OVMMBCMFPQUJPOBM
    Ͱͳ͍Ҿ਺ͳΒ
    OVMMOJM
    ͷςετ͸ෆཁ
     ෆਖ਼ͳ஋ͷՄೳੑͷഉআ
    DG
    ಡΈ΍͍͢ίʔυͷΨΠυϥΠϯ
    
    ষ
    ໢ཏͷͨΊʹʮςετΛ૿΍͢ʯ
    ΑΓ΋
    ʮίʔυΛ੍໿͢Δʯ ੩తݕূʹஔ͖׵͑Δ
    
15. class CreateAccountUseCase { fun execute(accountName: String, email: String, type: AccountType): CreationResult { if (type == AccountType.ADMIN) { return CreationResult.Failure(ErrorType.INVALID_ACCOUNT_TYPE) } /*...*/ return CreationResult.Success } ੩తݕূʹஔ͖׵͑Δ
    
16. class CreateAccountUseCase { fun execute(request: CreateAccountRequest): CreationResult { /*...*/ return CreationResult.Success } class CreateAccountRequest private constructor(accountName: String, /*...*/) { companion object { fun of(/*...*/): CreateAccountRequest? = if (type != AccountType.ADMIN) CreateAccountRequest(/*...*/) else null } } ੩తݕূʹஔ͖׵͑Δ
    
17. ςετର৅ΛݮΒ͢
     έʔεΛந৅Խ෼ղ͢Δ
     ੩తݕূʹஔ͖׵͑Δ
    ϩδοΫͷॏෳΛݮΒ͢
     ύϥϝʔλͱϩδοΫΛ෼཭͢Δ
     5FTU
    6UJMJUZ
    Λ࡞Δ ࠷খݶͷςετΛ࣮ݱ͢ΔͨΊʹ
18. ʮԿΛςετ͢Δ͔ʯͱʮͲ͏ςετ͢Δ͔ʯΛ෼͚Δ
     Կ
    ςετύϥϝʔλ
     Ͳ͏
    ςετϩδοΫ
    ʮҟͳΔύϥϝʔλ
    
    ಉ͡ςετϩδοΫʯͱͳΔέʔε͸ଟ͍
     ύϥϝλϥΠζυςετΛར༻ ύϥϝʔλͱϩδοΫΛ෼཭͢Δ
    
19. ϑϨʔϜϫʔΫͷ࢓૊Έ͔ϧʔϓΛ࢖͏
    data class TestParams(val accountName: String, val isValid: Boolean, val description: String) context("Creates account for names") { withData( TestParams("", false, "Empty name is invalid"), TestParams("My account", false, "Name with whitespaces is invalid"), TestParams("myaccount", true, "Valid name with only lowercase letters"), /*...*/ ) { (accountName, isValid) -> val request = CreateAccountRequest.of(accountName, "", AccountType.FREE) (request != null) shouldBe isValid } } έʔεͷҧ͍ͱ໢ཏੑ͕෼͔Γ΍͘͢ͳΔ ύϥϝʔλͱϩδοΫΛ෼཭͢Δ
    
20. ςετର৅ΛݮΒ͢
     έʔεΛந৅Խ෼ղ͢Δ
     ੩తݕূʹஔ͖׵͑Δ
    ϩδοΫͷॏෳΛݮΒ͢
     ύϥϝʔλͱϩδοΫΛ෼཭͢Δ
     5FTU
    6UJMJUZ
    Λ࡞Δ ࠷খݶͷςετΛ࣮ݱ͢ΔͨΊʹ
21. ςετϩδοΫΛ෦෼తʹ·ͱΊΔ
     ྫ
    'BLF
    'BDUPSZ
    'JYUVSF
    ʜ
     ର৅
    ηοτΞοϓ
    ݕূ
    ςΟΞμ΢ϯ
    ʜ
     ޮՌ
    ந৅ԽʹΑΔςετՄಡੑͷ޲্
    ෼ذ͸
    5FTU
    6UJMJUZ
    ಺ͳΒڐ༰͞ΕΔ͜ͱ΋͋Δ
     6UJMJUZ
    ࣗମΛςετՄೳ
    
    ܁Γฦ͠ͷར༻ʹΑΔݕূ 5FTU
    6UJMJUZ
    Λ࡞Δ
22. ςετର৅ΛݮΒ͢
     έʔεΛந৅Խ෼ղ͢Δ
     ੩తݕূʹஔ͖׵͑Δ
    ϩδοΫͷॏෳΛݮΒ͢
     ύϥϝʔλͱϩδοΫΛ෼཭͢Δ
     5FTU
    6UJMJUZ
    Λ࡞Δ ࠷খݶͷςετΛ࣮ݱ͢ΔͨΊʹ
23. ςετ͸඼࣭ͱੜ࢈ੑͷͨΊ
     ޮՌతͳςετΛߟ͑Δ
     ඞཁ࠷௿ݶͷςετ
    
    ςετϩδοΫͷॏෳͷղফ
    ϧʔϧͷ໨తʹ஫ҙ
     ඞཁͳΒ͜ͷεϥΠυΛ࢖ͬͯٞ࿦ ·ͱΊ